ConvertListToMap.java

ConvertListToMap.java

@Test
public void test_convertListToMap () {

	// create a list
	List<Movie> movies = Lists.newArrayList();
	movies.add(new Movie(1, "The Shawshank Redemption"));
	movies.add(new Movie(2, "The Godfather"));
	
	// convert list to map 
	Map<Integer,Movie> mappedMovies = Maps.uniqueIndex(movies, new Function <Movie,Integer> () {
		  public Integer apply(Movie from) {
		    return from.getRank(); // or something else
	}});
	
	assertTrue(mappedMovies.size() == 2);
	assertEquals("The Shawshank Redemption", mappedMovies.get(1).getDescription());
}

class Movie {

	private Integer rank;
	private String description;
	
	public Movie(Integer rank, String description) {
		super();
		this.rank = rank;
		this.description = description;
	}
	
	public Integer getRank() {
		return rank;
	}

	public String getDescription() {
		return description;
	}
	
}